Nature of Magnetic Excitations in the High-Field Phase of α-RuCl_{3}.

We present comprehensive electron spin resonance (ESR) studies of in-plane oriented single crystals of α-RuCl_{3}, a quasi-two-dimensional material with honeycomb structure, focusing on its high-field spin dynamics. The measurements were performed in magnetic fields up to 16 T, applied along the [110] and [100] directions. Several ESR modes were detected. Combining our findings with recent inelastic neutron- and Raman-scattering data, we identified most of the observed excitations. Most importantly, we show that the low-temperature ESR response beyond the boundary of the magnetically ordered region is dominated by single- and two-particle processes with magnons as elementary excitations. The peculiarities of the excitation spectrum in the vicinity of the critical field are discussed.

[The autonomic mechanisms of the initial manifestations of cerebral circulatory failure and a method for their correction]. / Vegetativnye mekhanizmy nachal'nykh proiavlenii nedostatochnsti krovosnabzheniia mozga i sposob ikh korrektsii.

Initial manifestations of cerebrovascular insufficiency against the background of atherosclerosis and hypertensive disease were evaluated in 50 sailors. Vegetative dysfunctions in these patients showed different states of the vegetative tone reactivity. It was found that ultraviolet irradiation of the blood produced a positive effect on the course of cerebro-vascular disturbances. The parasympathetic and sympathetic portions were selectively influenced.

[Ultrasonic dopplerography in the diagnosis of the initial manifestations of insufficiency of the blood supply to the brain]. / Ul'trazvukovaia dopplerografiia v diagnostike nachal'nykh proiavlenii nedostatochnosti krovoobrashcheniia mozga.

Sixty-eight patients with cerebrovascular insufficiency received a course of quantum hemotherapy by means of ultraviolet irradiation of the blood. The cerebral hemodynamics was evaluated by ultrasound transcranial dopplerography. It was found that this method may be used for early diagnosis as well as for the control of treatment efficacy. It was established that ultraviolet irradiation of the blood essentially effected the cerebral hemodynamics, reduces interhemispheric asymmetry, causes no cerebral steal syndromes.